I need an answer for 6.1.2 and 6.1.3

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Can someone me with 6 to 10 plz this is for masteries test.

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.